SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6e8a2d56ceb825c689f77daa1e10b1894baf27d2f4798f06625c908e149635' 
  AND token = 'CQVf4vJaZZoGu3lvKam3+2Hb04s5bOEqhjThP/T/l4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}